function getDataServer(url, vars){var xml = null;try{xml = new ActiveXObject("Microsoft.XMLHTTP");}catch(expeption){xml = new XMLHttpRequest();}xml.open("GET",url + vars, false);xml.send(null);if(xml.status == 404) alert("Url no valida");return xml.responseText;}

function nuevoAjax()
{
	var xmlhttp=false;
 	try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } 
	catch (e) 
	{ 
 		try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } 
		catch (E) { xmlhttp = false; }
  	}
	if (!xmlhttp && typeof XMLHttpRequest!='undefined') { xmlhttp = new XMLHttpRequest(); }
	return xmlhttp;
}